public static String decrypt(final String cipherText, final String passPhrase, final String saltValue, final int passwordIterations, final String initVector, final int keySize) throws Exception { final byte[] initVectorBytes = initVector.getBytes("ASCII"); final byte[] saltValueBytes = saltValue.getBytes("ASCII"); final byte[] cipherTextBytes = Base64.decode(cipherText); final PKCS5S1ParametersGenerator generator = new PasswordDeriveBytes(new SHA1Digest()); generator.init(passPhrase.getBytes("ASCII"), saltValueBytes, passwordIterations); final byte[] key = ((KeyParameter) generator.generateDerivedParameters(keySize)).getKey(); final SecretKey secretKey = new SecretKeySpec(key, ALGORITHM); final Cipher cipher = Cipher.getInstance(TRANSFORMATION); final IvParameterSpec iv = new IvParameterSpec(initVectorBytes); cipher.init(Cipher.DECRYPT_MODE, secretKey, iv); final byte[] decryptedVal = cipher.doFinal(cipherTextBytes); return new String(decryptedVal); }
/** * Generate a key parameter for use with a MAC derived from the password, * salt, and iteration count we are currently initialised with. * * @param keySize the size of the key we want (in bits) * @return a KeyParameter object. * @exception IllegalArgumentException if the key length larger than the base hash size. */ public CipherParameters generateDerivedMacParameters( int keySize) { return generateDerivedParameters(keySize); } }
/** * Generate a key parameter derived from the password, salt, and iteration * count we are currently initialised with. * * @param keySize the size of the key we want (in bits) * @return a KeyParameter object. * @exception IllegalArgumentException if the key length larger than the base hash size. */ public CipherParameters generateDerivedParameters( int keySize) { keySize = keySize / 8; if (keySize > digest.getDigestSize()) { throw new IllegalArgumentException( "Can't generate a derived key " + keySize + " bytes long."); } byte[] dKey = generateDerivedKey(); return new KeyParameter(dKey, 0, keySize); }
generator = new PKCS5S1ParametersGenerator(new MD2Digest()); break; case MD5: generator = new PKCS5S1ParametersGenerator(new MD5Digest()); break; case SHA1: generator = new PKCS5S1ParametersGenerator(new SHA1Digest()); break; default:
/** * Generate a key parameter for use with a MAC derived from the password, * salt, and iteration count we are currently initialised with. * * @param keySize the size of the key we want (in bits) * @return a KeyParameter object. * @exception IllegalArgumentException if the key length larger than the base hash size. */ public CipherParameters generateDerivedMacParameters( int keySize) { return generateDerivedParameters(keySize); } }
/** * Generate a key parameter derived from the password, salt, and iteration * count we are currently initialised with. * * @param keySize the size of the key we want (in bits) * @return a KeyParameter object. * @exception IllegalArgumentException if the key length larger than the base hash size. */ public CipherParameters generateDerivedParameters( int keySize) { keySize = keySize / 8; if (keySize > digest.getDigestSize()) { throw new IllegalArgumentException( "Can't generate a derived key " + keySize + " bytes long."); } byte[] dKey = generateDerivedKey(); return new KeyParameter(dKey, 0, keySize); }
generator = new PKCS5S1ParametersGenerator(new MD5Digest()); break; case SHA1: generator = new PKCS5S1ParametersGenerator(new SHA1Digest()); break; default:
generator.init(password, salt, 100); byte[] key = ((KeyParameter)generator.generateDerivedParameters(512)).getKey(); System.out.println( "64 " + new String(Hex.encode(key)).toUpperCase() );
/** * Generate a key with initialisation vector parameter derived from * the password, salt, and iteration count we are currently initialised * with. * * @param keySize the size of the key we want (in bits) * @param ivSize the size of the iv we want (in bits) * @return a ParametersWithIV object. * @exception IllegalArgumentException if keySize + ivSize is larger than the base hash size. */ public CipherParameters generateDerivedParameters( int keySize, int ivSize) { keySize = keySize / 8; ivSize = ivSize / 8; if ((keySize + ivSize) > digest.getDigestSize()) { throw new IllegalArgumentException( "Can't generate a derived key " + (keySize + ivSize) + " bytes long."); } byte[] dKey = generateDerivedKey(); return new ParametersWithIV(new KeyParameter(dKey, 0, keySize), dKey, keySize, ivSize); }
generator = new PKCS5S1ParametersGenerator(new MD5Digest()); break; case SHA1: generator = new PKCS5S1ParametersGenerator(new SHA1Digest()); break; default:
/** * Generate a key with initialisation vector parameter derived from * the password, salt, and iteration count we are currently initialised * with. * * @param keySize the size of the key we want (in bits) * @param ivSize the size of the iv we want (in bits) * @return a ParametersWithIV object. * @exception IllegalArgumentException if keySize + ivSize is larger than the base hash size. */ public CipherParameters generateDerivedParameters( int keySize, int ivSize) { keySize = keySize / 8; ivSize = ivSize / 8; if ((keySize + ivSize) > digest.getDigestSize()) { throw new IllegalArgumentException( "Can't generate a derived key " + (keySize + ivSize) + " bytes long."); } byte[] dKey = generateDerivedKey(); return new ParametersWithIV(new KeyParameter(dKey, 0, keySize), dKey, keySize, ivSize); }
generator = new PKCS5S1ParametersGenerator(new MD2Digest()); break; case MD5: generator = new PKCS5S1ParametersGenerator(DigestFactory.createMD5()); break; case SHA1: generator = new PKCS5S1ParametersGenerator(DigestFactory.createSHA1()); break; default: